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Note Derivative instruments and hedging activities (Non-hedging activities) (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of net gain (loss) recognized in income on derivatives | $ 1,273 | $ (923) | $ (124)
Forward contracts | Mortgage Banking Activities |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of net gain (loss) recognized in income on derivatives | 1,213 | (1,484) | (160)
Interest rate swap | Other operating income |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of net gain (loss) recognized in income on derivatives | 0 | 51 | 333
Foreign currency forward contracts | Other operating income |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of net gain (loss) recognized in income on derivatives | 0 | 67 | 27
Foreign currency forward contracts | Interest Expense |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of net gain (loss) recognized in income on derivatives | 0 | (14) | 12
Interest rate cap | Other operating income |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of net gain (loss) recognized in income on derivatives | (4) | (48) | 57
Indexed options on deposits | Interest Expense |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of net gain (loss) recognized in income on derivatives | 114 | 5,934 | 1,981
Bifurcated embedded options | Interest Expense |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of net gain (loss) recognized in income on derivatives | $ (50) | $ (5,429) | $ (2,374)

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- Definition Aggregate net gain and losses (whether realized or unrealized) on all derivative instruments held for trading purposes whether or not settled physically. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4F -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624186-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41322-113958 + Details
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